of hartford



E.K,ROOT. SLIDE LATHE.

Patiented May 15,

To alliohtimit mag 55mm.-

Be it known that I, E. Roo'r,,of Hartford, in the State 50f Gonnecticut, have in- Slide Lathes Adapted to Turning Cones, of i :act description,reference being had to the; accompanying drawings, making part of this specification, in whicha provedlathe; Fig. 2,;across vertical section a 1 j a EQK. ROOT, OF HARTFORD, CONNECTICUT.

SLIDE-LATHE.

Specification Letters'I atent No. 12,874, :dated May 15, 1855.

vented a new land 1 useful Improvement in which the followingis arfull, clear, and ex- Figure l, is afront elevation of my imtaken at the line Afa of Fig. 1;Fig. 3, a separate top view of the cutter post and i slide; Fig. 4, a separate top view of the cutter: carriage; and Fig; 5, an elevation and inverted view ofjther'ack and groovedwheel for giving the required motion to the cutter slide for turning tapers or cones. The same letters indicate like parts in all In turning tapers or cones in slide lathes as heretofore constructed the taper is ob- :tained by shifti-ngjthe poppet, which carries the center, forwardor back of the line of the axis of the mandrel. This is defective,

particularly whenseveral pieces are to be turned in successlon of the sametaper, for

the reason that the slightest variation in the i ii length of the pieces to be turned, or of the center in the poppet from the center'on the mandrel, or from the face of the chuck,

which cannot bewell prevented, produces a variation in thef taper, so that theseveral.

pieces, thus turned, will vary in the taper, a defect which is seriously objectionable in manylkindsof work. h j a j The object of my invention is to give the taper in slide lathes by the motion of the tool headslide so that the taper will be the same inany number of pieces to be turned, however their length or the distance be tween the two centers may vary. And to this end, my invention consists in giving to the tool post slide a motion toward or from the line of the axis of the mandrel as the tool carriage makes its traverse motion by means of a sllding rack 1n thecarrlage and receiving motionfrom the feed motion or from someother sourcebut bearing a certain relation thereto, the said rack havlng a wrist pin which travels in a groove. in the faceof a platein the tool post slide, whlch platecan be turned and set to give the groove any desired inclination with the line ofmotion' of the carriage, so that as the tool carriagetraverses longitudinally to give the in a recess in the carriage.

,feed motion the said rackmoving withaveloc ty hav ng a determined relation thereto,

its wrist pin will travel in the-groove of the adjustable plate in the ;*tool post slide, and thus in proporition'to-the oblique positionaof this groove, determined by the set, cause the slide with the tool ,post gradually to appreach or recede from the line of the axisiof the mandrel; the two motions, when the parts are set, always havethersamerelations the one to the other, so that the same taper may be repeated any numberof times without reference to the length,

The accompanying drawings represent a slide lathe of a well known construction not necessary to be described, but in which the feed motion is given to the tool carriage (a,) bya line shaft 6, feathered from end to end, which carries and turns a worm 0, connected by a collar d, with the carriage a.

This worm imparts motion to a train of wheels 6, f, g, in the carriage, and one (g) of which engages the cogs of a fixed rack h, attached to the frame.

The arborof the wheel 9, passes through a ries a pinion i, which engages a wheel 7', the

cogs of which engage the cogs of an auxiliary rack k, fitted to slide longitudinally There is a wrist pin Z, projecting from the top of this rack, and fitted to a block of metal m, which is in turn fitted to slide accurately in a groove it, made in the under face of a circular plate 0, fitted to turn accurately in a recess in the bottom of the tool post slide 27, which slides accurately between ways g, g, on the top of the carriage and at rightangles to the motion of the carriage. The periphery of the plate 0, has spurs which are engaged by a worm r, the arbor of which passes to the front of the tool post slide where it can be turned by a key to turn the said plate so as to give the groove 47,, any desired inclination to the line of motion of' the carriage, and when the required inclination has been obtained, which may be determined by any suitable means or by graduations on the face of the plate and the slide, it is firmly held in place by a set screw 8.

The tool post 6, is mounted in the usual manner in a block a, adjustable, for the depth of cut, by an adjusting screw '22, and the bed plate on which the block it slides is connected with the slide p, by a wrist pin w, at the forward end, so that the bed can be 1turned to give any angle desired to the too From the foregoing it will be seen that as the carriage is moved from end to end by the feed motion the auxiliary rack k, will be caused to move by a motion having a fixed relation to the feed motion of the carriage, and as the wrist pin Z, of this rack 79, with its sliding block, slides in the groove 1;, of the circular plate 0, if that groove has an inclination to the line of motion of the carriage a. motion will be given to the tool post slide go, toward or from the line of the axis of the mandrel, the ratio of which to the feed motion of the carriage will depend upon the motion of the auxiliary rack is,

relatively to the feed motion, and the inclination of the groove 01, to the line of motion of the carriage; and as the motion of the auxiliary rack 74, has afixed relation to the feed motion, it follows that by determining the inclination of the groove n, to the line of motion of the carriage, any determined taper can be turned.

It will be obvious from the foregoing that when the groove a, in the circular plate 0, is set parallel with the line of motion of the carriage that the lathe will operate like the ordinary slide lathe to turn cylinders.

What I claim as my invention and desire to secure by Letters Patent, for turning tapers on slide lathes, is-

Giving to the tool post slide a motion toward or from the line of the axis of the mandrel, by means substantially as herein described, or any equivalent therefor, in combination with the longitudinal feed motion of the carriage, and derived therefrom or hearing a certain relation thereto, substantially as described.

E. K. ROOT.

Witnesses:

GEORGE G. SILL, R. D. HUBBARD. 

